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UHPLC-MS/MS chromatograms of red clover isoflavones extracted from (A) hydrolyzed human serum obtained from a woman volunteer 5 h after consuming an ethanolic extract of the aerial parts of red clover that had been standardized to 120 mg isoflavones; (B) a commercial dietary supplement (RCC003); and (C) isoflavone standards spiked into blank human serum at the medium QC level.
